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Message: <blockquote data-quote="wakedown" data-source="post: 7899490" data-attributes="member: 15901">I'm not sure what the infatuation is with Amazon sales rank for a niche category - there's a steep decay for daily units where position #15+ could be going days without a single unit sale in the US as long as there was a steady but low demand for the product.Here's a rough layman explanation of the sales rank: <a href="https://selfpublishingadvice.org/amazon-sales-rank-taming-the-algorithm/" target="_blank">Sales Rank Algo</a>There's a a pair of Kindle books at #9 and #12 in Fantasy Gaming at the moment, both released in the 45-60 day range.   Small authors usually have no issue sharing their unit sales, but roughly to sustain a Top 10ish position in this category 45+ days after a release you're looking at 0-5 units a day with wild swings, sometimes multiple days in a row with zero sales.You're better off using the overall, non-categorical rankings to tease out relative popularity.  You can find books with limited known print runs (like ~2500 copies) in Amazon's Top 20,000.If you want to really tease out PF2 success (are GMs purchasing the materials to run it), I'd say watch the overall rank of the Bestiary and see if it operates in the range where it's at least breaking 10+ copies sold per week.</blockquote>